They can have as many as four; that's meant to be Master Shak-Ti, a colleague of mine. If these were in color, they'd be even more interesting-- Togruta have bright orange skin, white markings, and the stripes on their heads are typically blue on white. It's quite striking.

[He taps each of the drawings, denoting the color, green, blue, black, as each requires.]

And this isn't even half of it. Don't even get me started on the language difficulties.